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Probe tack of tackified acrylic emulsion PSAs
Kim, Birm-June,Kim, Sung-Eun,Do, Hyun-Sung,Kim, Sumin,Kim, Hyun-Joong Elsevier 2007 International journal of adhesion and adhesives Vol.27 No.2
<P><B>Abstract</B></P><P>Water-based acrylic, pressure sensitive adhesives (PSAs) were prepared by addition of aqueous rosin esters dispersions. PSA films were laminated to corona-treated PET film of 50μm average thickness by transfer-coating. The glass transition temperature (<I>T</I><SUB>g</SUB>) was measured using differential scanning calorimetry (DSC). The probe tack test was conducted using texture analyzer. The tack performance of tackified emulsion PSAs were affected by the <I>T</I><SUB>g</SUB> of bulk PSAs, as well as by the miscibility and tackifier contents.</P>
PLA/PA1010 FDM 3D 프린팅 복합재의 특성에 대한 출력속도와 폴리아마이드 함량의 영향
김범준 ( Birm-june Kim ),서영록 ( Young-rok Seo ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.1
Fused deposition modeling (FDM) is a 3D printing technology for extruding molten thermoplastic filaments by a heated nozzle and then depositing individual layers to form a 3D shape. FDM 3D printing has various parameters including nozzle temperature, printing speed, infill density, and orientation. When controlling these parameters, the properties of the 3D printed objects are affected. Polylactic acid (PLA) is a representative bioplastic widely utilized in industry because of its high stiffness, excellent biodegradability and processability. Bio-based polyamide 1010 (PA1010) is an promising engineering plastic due to its renewability and sustainability. In this study, the effects of printing speeds and polyamide contents on the various properties of PLA/PA1010 3D printed composites were investigated. Microfibrillation of PA1010 was induced in the PLA matrix by using the viscosity difference between PLA and PA1010. PLA/PA1010 blends were melt-compounded at a certain temperature set and successfully prepared as filaments for FDM 3D printing applications. To achieve in situ microfibrillation, PLA/PA1010 blends were 3D printed at over 100 mm/s. SEM images showed the changes of polyamide morphologies in the PLA/PA1010 blends depending on the different printing speeds and the viscoelastic properties of 3D printed PLA/PA1010 blends were remarkably enhanced by increasing the printing speed. In addition, flexural and thermal properties were affected by changes in the polyamide contents of the PLA/PA1010 blends.
유리섬유가 충전된 공압출 목재ㆍ플라스틱 복합재의 굽힘 특성에 관한 연구
김범준(Birm-June Kim) 한국가구학회 2013 한국가구학회지 Vol.24 No.4
In this study, the effect of various glass fiber (GF) contents in a shell layer and shell thickness changes on the flexural property of coextruded wood plastic composites (WPCs) in combination with three core systems (weak, moderate, and strong) was investigated. GF behaved as an effective reinforcement for the whole coextruded WPCs and GF alignments in the shell layer played an important role in determining the flexural property of the coextruded WPCs. At a given shell thickness, the flexural property of the whole coextruded WPCs was improved with the increase of GF content in shell. For core quality, when the core is weak, increase of GF content in shell led to improved flexural property of the whole composites and increase of shell thickness helped it. On the other hand, when the core is strong, the flexural property of the whole composites showed reduced features at low GF content in shell and increase of shell thickness aggravated it. This approach provides a method for optimizing performance of the coextruded WPCs with various combinations of core-shell structure and properties.
국내산 파티클보드에 대한 나무못의 직경과 천공여척이 나무못 유지력에 미치는 영향
김범준(Birm-June Kim),차재경(JaeKyung Cha) 한국가구학회 2017 한국가구학회지 Vol.28 No.1
Wooden dowels are commonly used to join the particleboard members together in many types of structures, But little information is available concerning their holding properties in domestic particleboard. This study was performed to determine the withdrawal loads and strengths on the effect of diameter of dowel and hole clearance. The test block was manufactured from 15 mm thick domestic particleboard. The dowel was manufactured 6, 8 and 10 mm diameters from korean castanea, korean pine and tuliptree. Research reported here indicates that withdrawal loads increase, but withdrawal strengths decrease, as the dowel diameter increases. This study also indicates that dowel withholding load and strength for particleboard less decrease than those for domestic wood as a hole clearance decreases.
MFC와 Lignin이 충전된 DLP 3D 프린팅 복합재료의 특성에 대한 연구
김범준 ( Birm-june Kim ),박종인 ( Jong-in Park ),이동현 ( Dong-hyun Lee ),최원제 ( Won-je Choi ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.2
Micro-fibrillated Cellulose (MFC) and/or lignin were added to liquid photo-curable resins, and then the resin blends were 3D-printed by using a DLP 3D Printer. To investigate the behaviors of the MFC and/or lignin in photopolymer resin matrix, scanning electron microscope (SEM) was used and then the morphological properties of DLP 3D-printed composites were analyzed. At the same filler loading level (1 wt.%), both MFC and MFC/lignin filled composites showed properly dispersed particle features in photopolymer resin matrix. However, flexural strength values were different and remarkably improved strengths were observed in MFC filled composites due to the relatively good interfacial adhesion of MFC particles to the matrix. This study suggested a new application of cellulose fiber in the 3D printing industry where research on 3D printing materials is insufficient.
( Seung-kyun Kim ),( Young-rok Seo ),( Jae-gyoung Gwon ),( Sun-young Lee ),( Birm-june Kim ) 한국목재공학회 2018 한국목재공학회 학술발표논문집 Vol.2018 No.1
Through analysis of thermal properties of composites according to the addition ratio of microfibril fiber based on engineering plastics and nano-clay, We have investigated whether this is suitable for shell layer application of coextrusion WPC. In the experiment, Polyethylene Terephthalate (PET) was used Recycled-Clear PET flake and High density polyethylene (HDPE) used two products with different melt flow index. and Maleic anhydride - grafted polyethylene (MAPE) and nano-clay were used as additives. The composite specimen to be used in the experiment was prepared as a two step step. In the first step, high density polyethylene and recycled PET were mixed in a ratio of 70 : 30, followed by stretch extrusion to make a master batch in which a microfibril was formed, Then, another master batch with MAPE, HDPE, and Nano-clay mixed at 35:35:30 was prepared, and these two master batches and HDPE were used to prepare a sample with 9 different combinations. The specimens were manufactured through extrusion and injection processes, and thermal properties analysis were carried out. As a result of the Thermogravimetric analysis (TGA), Differential Scanning Calorimetry (DSC), HDPE is a thermally highly stable material and high thermal stability of HDPE-rich specimens can be confirmed. Since the pyrolysis temperature of PE is around 440 ℃ and the pyrolysis temperature of PET is 391 ℃, the pyrolysis is delayed as the content of PE as a whole increases and as the PET content decreases. It was also found that the addition of 6% clay increased the pyrolysis temperature more than that of 3% addition. It is considered that the clay which is a layered structure blocks the heat transmitted from the outside and the thermal stability is increased. As a whole, the melting temperature (Tm) of PET microfibril and nanoclay-added composites increased more than pure polyethylene. In addition, the values of PET microfibril and nanoclay added composites were lower than those of pure polyethylene in melting enthalpy (ΔHm). This indicates that the content of PET having a melting point higher than that of polyethylene is increased, and the mobility of the polymer chain is lowered due to the addition of fiber or nano size filler. From these results, it is considered that the nano size additive such as nano-clay will improve the thermal properties and will be effective as reinforcement filler. In addition, when recycled waste PET is added to composites, it is expected to bring economic benefits such as reduction of raw material cost.
팽창성 흑연과 금속수산화물이 목재·플라스틱 복합재의 특성에 미치는 영향에 관한 연구
김승균(Seungkyun Kim),이단비(Danbee Lee),이선영(Sun-Young Lee),전상진(Sang-Jin Chun),김범준(Birm-June Kim) 한국가구학회 2016 한국가구학회지 Vol.27 No.4
Wood-plastic composites (WPCs) composed of mainly wood flour and thermoplastics have attracted considerable attentions due to advantages of cost effectiveness, high durability, and microbial resistance. However, relatively poor fire resistance of WPCs from low thermal stability of wood and plastics prevents further uses. This study investigated the effect of expandable graphite (EG) and aluminium hydroxide (AH)/magnesium hydroxide (MH) on the properties of WPCs. The combined incorporation of both EG and metal hydroxide (i.e., AH or MH) into formulations leads to higher flexural modulus of filled composites compared to neat PP and WPC. In thermal properties, EG played an important role in improving thermal stability of filled composites by suppressing thermal decompositions of wood and PP. Moreover, EG showed better water absorption features. From this research, it can be said that EG and metal hydroxides have potentials as effective reinforcement, flame retardant, and moisture barrier.